You can't have proof for something outside of the universe, because if you're trying to get proof, you are using science, deductivity, inductivity or any other logical device that is used to explain natural phenomena, it is impossible to 'prove' a supernatural phenomena.

Does'nt this poster realise that Jesus is regarded as one of the avatars of Krishna within Hinduism, with the result that if Jesus exists, Krishna & the rest of the Hindu religious pantheon must therefore also exist...